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