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