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