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