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