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