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