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