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