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