One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,8)(6,7)(10,13)(14,16)(18,23)(21,32)(24,31)(25,29) involution — undirected(1,3,6,5)(2,4,7,8)(9,10,12,13)(11,14,15,16)(17,18,22,23)(19,24,28,31)(20,29,30,25)(21,26,32,27)(2,7)(4,8)(18,23)(20,30)(24,31)(26,27) involution — undirected(1,4,6,8)(2,3,7,5)(9,11,12,15)(10,14,13,16)(17,19,22,28)(18,24,23,31)(20,27,30,26)(21,25,32,29)(1,5,6,3)(2,8,7,4)(17,20)(18,25)(19,27)(21,31)(22,30)(23,29)(24,32)(26,28)(17,21,22,32)(18,26,23,27)(19,25,28,29)(20,31,30,24)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.