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