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