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