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