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