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