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