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