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