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