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