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)(14,18)(15,20)(21,22,25,27)(23,24,28,26)(5,7)(6,9)(8,12)(10,11)(13,14)(15,16)(17,18)(19,20)(21,23,25,28)(22,26,27,24)(6,10)(9,11)(14,18)(16,19)(22,27)(23,28) involution — undirected(1,2)(3,4)(5,7)(6,9)(8,12)(10,11)(13,15)(14,19)(16,18)(17,20)(21,24,25,26)(22,28,27,23)(5,6)(7,9)(8,10)(11,12)(13,16,17,19)(14,15,18,20)(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.