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