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