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