One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,6,9,13)(4,11,12,7)(10,16,15,14)(21,29)(26,30)(27,32)(28,31)(33,34,39,43)(35,42,38,40)(36,37,47,41)(44,45,46,48)(1,2)(3,6)(4,7)(5,8)(9,13)(10,14)(11,12)(15,16)(17,18)(19,24)(20,25)(21,26)(22,23)(27,31)(28,32)(29,30)(33,35,39,38)(34,40,43,42)(36,44,47,46)(37,48,41,45)(3,9)(6,13)(10,15)(14,16)(18,23)(20,24)(26,30)(28,31)(33,36)(34,41)(35,44)(37,43)(38,46)(39,47)(40,45)(42,48) involution — undirected(1,2)(3,6)(4,7)(5,8)(9,13)(10,14)(11,12)(15,16)(17,19,22,25)(18,24,23,20)(21,27,29,32)(26,31,30,28)(33,37,39,41)(34,36,43,47)(35,45,38,48)(40,46,42,44)(1,3,5,9)(2,6,8,13)(4,10,12,15)(7,14,11,16)(17,20,22,24)(18,25,23,19)(21,28,29,31)(26,32,30,27)(33,35,39,38)(34,42,43,40)(36,44,47,46)(37,45,41,48)(1,4,5,12)(2,7,8,11)(3,10,9,15)(6,14,13,16)(17,21)(18,26)(19,27)(20,28)(22,29)(23,30)(24,31)(25,32)(33,38,39,35)(34,40,43,42)(36,46,47,44)(37,48,41,45)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.