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