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