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)(23,26)(24,28)(25,27)(29,33)(30,35)(31,34)(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)(25,31)(27,34)(28,33)(30,32)(35,36) involution — undirected(1,3,4,2)(6,12)(8,9)(11,18)(13,14)(15,17)(19,20)(23,29)(24,32)(26,33)(28,36)(30,31)(34,35)(5,8,10,9)(6,13,14,12)(7,15,16,17)(11,18,20,19)(22,27)(26,34)(28,36)(33,35)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.