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)(30,44)(31,40)(33,39)(36,41)(37,42)(38,45)(43,46)(47,48) involution — undirected(1,2)(3,9)(4,7)(5,8)(6,11)(10,15)(12,14)(13,16)(17,19,21,32,23,31,22,33)(18,24,27,29,28,39,26,40)(20,30,35,46,36,45,37,47)(25,38,34,43,42,44,41,48)(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)(26,41)(27,34)(28,42)(29,43)(31,45)(32,46)(33,47)(39,44)(40,48)(1,4,5,13)(2,7,8,16)(3,10,11,12)(6,14,9,15)(19,31)(24,39)(29,40)(30,45)(32,33)(38,44)(43,48)(46,47)(2,8)(6,9)(7,16)(14,15)(17,21,23,22)(18,26,28,27)(19,32,31,33)(20,35,36,37)(24,40,39,29)(25,41,42,34)(30,46,45,47)(38,48,44,43)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.