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