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