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