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