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