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