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