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)(11,13)(12,14)(15,16)(17,18,22,24)(19,25,28,32)(20,27,21,26)(23,30,31,29)(9,11)(10,13)(12,15)(14,16)(17,19,22,28)(18,23,24,31)(20,29,21,30)(25,27,32,26)(1,3,5,4)(2,6,7,8)(11,15)(13,16)(18,24)(19,28)(26,27)(29,30)(11,15)(13,16)(17,19)(18,25)(20,30)(21,29)(22,28)(23,26)(24,32)(27,31) involution — undirected(1,4,5,3)(2,6,7,8)(10,14)(13,16)(17,20,22,21)(18,26,24,27)(19,29,28,30)(23,25,31,32)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.