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