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