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