One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6,11,12)(7,10,9,8)(14,18)(19,20)(5,7,11,9)(6,8,12,10)(13,14,17,18)(15,19,16,20)(2,4)(5,8,11,10)(6,9,12,7)(13,15,17,16)(14,19,18,20)(1,2)(3,4)(5,7,11,9)(6,8,12,10)(13,15,17,16)(14,19,18,20)(5,9,11,7)(6,8,12,10)(13,15,17,16)(14,19,18,20)(5,10,11,8)(6,9,12,7)(13,16,17,15)(14,20,18,19)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.