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