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