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