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