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