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)(19,26)(21,22)(25,29)(27,28)(30,31) involution — undirected(1,3,5,4)(2,6,7,8)(10,14)(12,15)(17,18)(19,29)(20,30)(21,24)(22,27)(23,28)(25,31)(26,32)(9,10)(11,12)(13,14)(15,16)(17,19,23,31)(18,25,28,29)(20,24,32,27)(21,30,22,26)(1,4,5,3)(2,6,7,8)(9,11,13,16)(10,15,14,12)(17,20,23,32)(18,26,28,30)(19,27,31,24)(21,25,22,29)(9,12,13,15)(10,11,14,16)(17,21,23,22)(18,27,28,24)(19,30,31,26)(20,29,32,25)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.