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