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