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