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)(21,22,25,28)(23,26,30,35)(24,32,33,27)(29,36,31,34)(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)(28,35)(31,33)(32,36) involution — undirected(1,3,4,2)(5,7)(6,12)(8,15)(9,17)(10,16)(11,18)(13,20)(14,19)(23,29)(24,33)(26,34)(27,32)(30,31)(35,36)(5,8,10,9)(6,13,14,18)(7,15,16,17)(11,12,20,19)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.