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