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