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