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)(15,19)(16,18)(17,20)(21,22,25,28)(23,26,29,33)(24,31,32,27)(30,36,35,34)(6,9)(10,11)(13,15,18,20)(14,17,16,19)(23,29)(26,33)(30,35)(34,36)(7,12)(10,11)(14,16)(15,20)(21,23)(22,26)(24,30)(25,29)(27,34)(28,33)(31,36)(32,35) involution — undirected(1,2)(3,4)(5,7,8,12)(6,10,9,11)(13,16,18,14)(15,17,20,19)(21,22)(23,26)(24,27)(25,28)(29,33)(30,34)(31,32)(35,36)(5,6)(7,10)(8,9)(11,12)(13,17)(14,15)(16,20)(18,19)(21,24,25,32)(22,27,28,31)(23,30,29,35)(26,34,33,36)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.