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