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