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