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