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