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