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