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