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