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