One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,8)(9,13)(10,11)(12,16)(14,15)(17,18)(19,20)(21,22)(23,30)(24,32)(25,27)(26,28)(29,34)(31,35)(33,36) involution — undirected(1,2,3,4)(23,26)(28,30)(31,33)(35,36)(6,11)(7,12)(13,18)(14,19)(21,23,27,26)(22,28,25,30)(24,31,34,33)(29,35,32,36)(5,7,10,12)(6,8,11,16)(9,14,17,19)(13,15,18,20)(21,24)(22,29)(23,31)(25,32)(26,33)(27,34)(28,35)(30,36)(5,8)(6,12)(7,11)(9,15)(10,16)(13,19)(14,18)(17,20)(21,25,27,22)(23,28,26,30)(24,32,34,29)(31,35,33,36)(5,9,10,17)(6,13,11,18)(7,14,12,19)(8,15,16,20)(21,26,27,23)(22,28,25,30)(24,33,34,31)(29,35,32,36)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.