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