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