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