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