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