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