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