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)(20,22)(21,31)(23,29)(24,26)(27,28)(30,32) involution — undirected(2,5)(3,7)(10,13)(11,15)(17,19,26,28,22,30,21,29)(18,23,31,32,20,27,24,25)(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,20,22,18)(19,27,30,23)(21,31,26,24)(25,29,32,28)(1,3,4,7)(2,6,5,8)(10,13)(14,16)(19,28)(21,26)(23,32)(24,31)(25,27)(29,30)(9,11,12,15)(10,14,13,16)(18,20)(23,27)(24,31)(25,32)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.