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