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