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