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