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