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