One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,9)(5,13)(6,7)(10,15)(11,12)(14,16)(17,18)(19,23)(20,26)(21,29)(22,24)(25,28)(27,32)(30,31)(33,34,39,41)(35,45,46,40)(36,37,43,42)(38,48,47,44)(2,7)(3,9)(10,13)(11,16)(17,19,22,28)(18,23,24,25)(20,29,31,27)(21,30,32,26)(33,35)(34,40)(36,47)(37,48)(38,43)(39,46)(41,45)(42,44)(2,7)(3,9)(10,13)(11,16)(18,24)(19,28)(26,30)(27,29)(34,41)(35,46)(36,43)(44,48) involution — undirected(1,3,6,9)(2,8,7,4)(5,11,15,16)(10,14,13,12)(17,19)(18,25)(20,29)(21,30)(22,28)(23,24)(26,32)(27,31)(33,36,39,43)(34,42,41,37)(35,47,46,38)(40,44,45,48)(1,4,6,8)(2,9,7,3)(5,14,15,12)(10,11,13,16)(17,20)(18,26)(19,29)(21,23)(22,31)(24,30)(25,32)(27,28)(33,37,39,42)(34,43,41,36)(35,44,46,48)(38,40,47,45)(1,5,6,15)(2,10,7,13)(3,11,9,16)(4,12,8,14)(17,21,22,32)(18,27,24,29)(19,30,28,26)(20,25,31,23)(33,38,39,47)(34,44,41,48)(35,43,46,36)(37,40,42,45)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.