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