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