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