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