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