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