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)(11,15)(12,14)(13,16)(17,18,23,27)(19,28,31,38)(20,25,32,40)(21,26,22,36)(24,34,39,30)(29,43,44,48)(33,41,35,42)(37,45,47,46)(1,3,4,8)(2,5,6,7)(9,11,12,16)(10,13,14,15)(20,32)(25,40)(29,44)(33,35)(37,47)(41,42)(43,48)(45,46)(1,2)(3,5)(4,6)(7,8)(11,16)(13,15)(17,19,21,34,23,31,22,30)(18,24,36,38,27,39,26,28)(20,29,35,45,32,44,33,46)(25,37,41,48,40,47,42,43)(2,6)(5,7)(10,14)(13,15)(17,20)(18,25)(19,29)(21,35)(22,33)(23,32)(24,37)(26,42)(27,40)(28,43)(30,46)(31,44)(34,45)(36,41)(38,48)(39,47) involution — undirected(3,8)(5,7)(17,21,23,22)(18,26,27,36)(19,30,31,34)(20,33,32,35)(24,38,39,28)(25,41,40,42)(29,45,44,46)(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.