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