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