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