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