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