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