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